TMS Square sensor & calibration tips                                          Your one-stop sound & vibration shop

Welcome to Issue #50


The team at The Modal Shop has been sending out this monthly training and tips newsletter for dynamic sensors for some time now!  An extensive 50 issues!  If you are new to our newsletter, please enjoy this short communication, share it with a colleague and have a look at the archive links below where you'll find all the back issues with their wealth of information.  


We're glad to have you on board!

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Tip of the Month

Know your sensor vendor's phone number... and the names of their experts.  Contrary to what marketing departments would like us to believe, it's not all on the internet. Call your vendor when you need to know details like: 
  1. Are there any mounting fixtures used at the factory when calibrating my triaxial accelerometer.  
  2. What is your policy on returns for sensitivity drift? 
  3. Can I expect the same uncertainties as the sales specification sheet when operating my calibration system?
Quick Links
ISO TC 108 - Mechanical vibration, shock and condition monitoring
ISO TC 108/SC 3 - Use and calibration of vibration and shock measuring instruments
Previous Newsletter
sensor & cal tips #49 -

Modal Excitation Tutorial; Purdue Center for Systems Integrity

sensor & cal tips #48 -

ED and Reference Limitations in Low Frequency Calibration; Multiple Component Order Tracking

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PCB Group Companies

Language of Metrology


The Modal Shop has been actively presenting one day seminars on dynamic sensing and calibration around the world.  This education on the function and structure of dynamic sensors (PE, VC, PR, etc) andBooks on Languages

the associated methods and means of calibration is key in keeping pace with global growth in acceleration sensing. 
Ensuring the users' control and confidence in dynamic analysis serves the measurement and engineering community, in everything from aerospace structures to consumer electronics to plant floor efficiencies.  


Last month, TMS Engineering Team Leader, Mr. Sang Kim, presented in his homeland of Korea.  The following is one of his leadoff presentations used to orient the audience in the framework of metrological terminology.  This presentation makes a nice primer, or overview, to share with your new hires and also includes a number of handy links to other useful resources.


... we've also been very active in regional NCSLi meetings across the US.  Let us know if you are interested in a seminar in your area.   


Click here to read more

Novel Uses for Accelerometers


I have to admit that one of my geeky, guilty pleasures is screening my daily Google alerts for accelerometer related news and developments.  This daily distraction gives me a few minutes of "mind candy."  It is really amazing to see just how far the humble accelerometer has come to be used by people, products and processes.   

 Novel Uses for Accelerometers


Without further delay, here are a few of my recent favorites...


Click here for a list of interesting accelerometer applications

Blast from the Past


For those who may be new to our newsletter, we wanted to highlight an article from a previous sensor & calibration tips - "Overview on Calibration and Measurement Uncertainty"...


Uncertain about your calibration uncertainty?


One of the most commonly debated issues among calibration professionals and often least understood by sensor users is the concept of measurement uncertainties.

To the novice user, the manufacturer's stated calibration is simply accepted as gospel.  However, a closer inspection of the calibration certificate reveals that the calibration lab is actually providing an INTERVAL, within which the value for the device is "certain" to lie and typically includes a statistical probablility distribution statement.  This omnipresent and expected interval is typically expressed in a tolerance term of plus or minus some level of percent... aka uncertainty.


Click here to read more

Bonus read for this month...


Here is a short but inspiring article from Quality Digest reminding us that we aren't the only ones with tight budgets and limited resources - "Three Things a For-Profit Business Can Learn from a Nonprofit"...


As you'll see, there are a few things we can learn from a well run non-profit.  It is interesting that the Non Profit
burning desire of people to do good/make a difference through work is actually changing the face of corporate legal structure.  To fulfill the needs of social entrepreneurship, there are already over a dozen states in the US that allow the formation of a new entity type named Low-Profit Limited Liability Corporations (L3C)


Click here to read more



We appreciate your interest and are glad to be providing regular information to help you with your dynamic testing and calibration needs.  



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20 Year StickerMichael J. Lally
The Modal Shop
A PCB Group Company